中科院2001生化B卷 一、是非题(1X10) 1.所有a氨基酸中的a碳原子都是一个不对称的碳原子() 2.蛋白质的四级结构可以定义为一些特定的三级结构的肽链通过共价键形成的大分子体系的组合()

英语作文最常用的100句 英语写作中100个使用频率较高的词语搭配 1.经济的快速发展 the rapid development of economy 2.人民生活水平的显著提高/稳步增长 the remarkable improvement steady growth of people's living standard 3.先进的科学技术 advanced science and technology

2.1 构建蛋白质的单体是 20 种氨基酸 2.2 一级结构：用肽键连接的氨基酸顺序 2.3 二级结构：多肽链能折叠成规则结构如 a-螺旋、b-片层、拐弯和环状结构。 2.4 三级结构：水溶性蛋白质折叠成具有疏水核的致密结构。 2.5 四级结构：数个多肽链组装成多亚基复合物结构 2.6 蛋白质的氨基酸序列决定蛋白质的三维结构

非谓语动词作状语时,它的逻舞主语应该是句子的主语。但有时 非谓语动词带有自己的主语,从而在结构上与主语不发生关系 我们称之为独立主格结构( Absolute Construction)。其实,所谓独 立主格结构”也并非真正独立,它还是一种从属的结构

由四级计算机组成的计算机集成制造系统(CIMS)实现了CAD、CAM和CAP。系统也有与之相适应的CAPM。借助于计算机系统和工艺、设备的综合能力,也是在CAD/CAM的基础上,实现了FMS,这使得在大生产过程中能充分满足每个用户的订货要求。系统的MRPⅡ对前工序的原料供应以justintime的原则进行了规划。本系统还在向更高层次的CIMS发展

一、掌握蛋白质的元素组成及特点、组成人体蛋白质的基本单位--氨基酸的种类及通式。 二、掌握蛋白质一、二、三、四级结构的概念及其稳定因素、掌握蛋白质二级结构的基本形式,了解肽、肽键、肽单元、模序、结构域的概念 三、掌握蛋白质(氨基酸)的等电点和两性电离、蛋白质变性及沉淀、盐析的概念

1 Crime has its own cycles, magazine some years ago. Police records that were studied for five years from over 2,400 cities and towns show a surprising link between changes in the seasons and crime patterns. July and August,as do rape and other violent attacks. Murder,moreover, is more than seasonal it is a weekend crime. It is also a nighttime crime: 62 percent of murders are

It is hard to get any agreement on the accurate meaning of the term \social class\. In everyday life, people tend to have a different approach to those they consider their equals from that which they assume with people they consid er higher or lower than themselves in the social scale. The criteria we use to“place new acquaintance(熟人), however, are complex mixture of factors. Dress, way of speaking, area of residence in a given city or province

If the salinity(含盐量)of ocean waters is analyzed, it is found to vary only slightly from place to place. Nevertheless, some of these small changes are important. There are three basic processes that cause a change in oceanic salinity. One of these is the subtraction of water from the ocean by means of evaporation-conversion of liquid water to water vapour. In this manner,the salinity is increased, since the salts stay behind. If this is carried to the extreme,of course, white crystals of salt would be left behind; this, by the way,is how much of the table salt we use is actually obtained

Unit 1 Fighting with the Forces of Nature Unit 2 Smart Cars Unit 3 Job Interview Unit 4 Multicultural Society Unit 5 Cruelty Unit 6 The Peace of Life